setup problem

[muna]

dear sir,
I have downloaded the cygwin setup softwere, and started installing
it. I have chosen download from internet , choose a ftp site and
downloaded the basic file. Then i installed the pakage. now i am filling
that i need some upgrade. if i get the xxxxx.tar.bz2 pakage then can
i add to my installation. if so then how.
again if i delete my old instalation and try to install again with
the new pakage includee, can i do that 



thanks for all,
mohd islam 




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